If you need to find information about a specific appointment you can use booxi in two ways:
1. From the search bar at the top of the calendar
Go to the Calendar Tab,
And enter the name of the client for whom you are looking for.
Press enter, and a list of appointment will appear, with the associated date.
2. From the Client file
Go to the Client tab,
And search for the client you want,
Then click on Appointment history.
From there you'd be able to find the appointment you are looking for.